Malicious PDF — malware analysis report

Static analysis result for SHA-256 01955936a9c485fa…

MALICIOUS

PDF

79.7 KB Created: 2021-06-03 05:42:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 452f63b5f7010e6acac93f6aa7f6fcdf SHA-1: 75014f7784d32b453a0d0d6b379d9e63fbf82185 SHA-256: 01955936a9c485fa512aacc6f1a5d75ff7757c6ce297043fa51deef6b6641e30
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains multiple external URIs, with a prominent one pointing to 'vilenefex.ru'. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF is part of a link farm on disposable hosting, suggesting a phishing or malicious redirection scheme. ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious intent, likely to redirect users to a phishing site or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://vilenefex.ru/123?utm_term=fisica+moderna+atomica+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4448980/normal_5fc7c52c3ebd5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387813/normal_606de03f4c90c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478402/normal_6068e14123614.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450250/normal_6014666f7a95d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366350/normal_606b6565db5fb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450634/normal_6015332cc9057.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388280/normal_5ffce36294e40.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459926/normal_6028f2c6a5a49.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/c7982b20-3260-4434-8091-08492c5147d1/kaguzipaxowezirot.pdfIn PDF document text
    • http://sorawako.pbworks.com/f/mivozedugolol.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7ec48afa-1e47-4be0-8e16-08d6b7e23e44/bojun.pdfIn PDF document text
    • http://garigor.pbworks.com/f/35163397382.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8f6150b6-a5e7-4903-bf39-b51a19f3e77d/how_to_clean_kinetico_salt_tank.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b244168c-8e98-4318-8d23-e37784aee9ef/nurozisasaluv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/64ca627e-f71c-43f2-8c65-b6546c675e69/jipugowilojupagakuvudil.pdfIn PDF document text
    • http://bofamawetodo.pbworks.com/w/file/fetch/144440427/sewuxurevidatot.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f4148ac4-2d86-4d09-b5bf-d23a3e4ac466/lofakep.pdfIn PDF document text
    • http://wudiwiligis.pbworks.com/f/8890687388.pdfIn PDF document text
    • http://giresizuloki.pbworks.com/w/file/fetch/144431664/97066951797.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4f4c0a24-0067-49c9-a90c-f326c97c03ec/74077171420.pdfIn PDF document text
    • http://zajozote.pbworks.com/f/zejivetam.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dc78150a-7a37-43af-b604-0cec5e044002/87282964335.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC6B 5224 bytes
SHA-256: 6fdc389e09bf9dcafe701e0e219064e6013aaca31c3e442e8e084caf22d85a21
font_01_sfnt_off0000fe15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE15 2520 bytes
SHA-256: a76029d7adb10d5616584c4c91c3c77ab6d6120a7111bf6603fbf1a401b12fee
font_02_sfnt_off0001086a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1086A 13300 bytes
SHA-256: 1a2b096eb117bed2f24339922d6b8a89419e4aae028d46bfa12be03c0fe5bed3

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